com.mhuss.AstroLib
Class MathOps

java.lang.Object
  com.mhuss.AstroLib.MathOps

public class MathOps
extends java.lang.Object

MathOps contains some useful trig, vector and matrix operations.

Based on C code by Bill Gray (www.projectpluto.com)

Field Summary

static int

VECTOR_SIZE

Constructor Summary

MathOps()

Method Summary

static double	acose(double arg) Calculates the arc cosine, but limits the input to the range ( -1.0 < rad < +1.0 ).
static double	asine(double arg) Calculates the arc sine, but limits the input to the range ( -1.0 < rad < +1.0 ).
static void	cartesianToPolar(double[] cartVect, double[] polarCoord)
static void	polarToCartesian(double[] vectC, double[] vectP) Convert polar coordinates with radius to Cartesian coordinates added by w.
static void	polarToCartesian(double[] vect, double lon, double lat, double radius) Convert polar coordinates with radius to Cartesian coordinates added by w.
static void	rotateVector(double[] v, double angle, int axis) Rotate a vector along the specified axis.
static void	setIdentityMatrix(double[] matrix) Initializes a matrix to base (identity) values.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

VECTOR_SIZE

public static final int VECTOR_SIZE

See Also:

Constant Field Values

Constructor Detail

MathOps

public MathOps()

Method Detail

acose

public static double acose(double arg)

Calculates the arc cosine, but limits the input to the range ( -1.0 < rad < +1.0 ).
This avoids overflow errors. If the input is <= -1.0 radians, Math.PI is returned. If the input is >= 1.0 radians, 0 is returned.

Parameters:

arg - The angle in radians

Returns:

The arc cosine, limited to the range 0 to Pi.

asine

public static double asine(double arg)

Calculates the arc sine, but limits the input to the range ( -1.0 < rad < +1.0 ).
This avoids overflow errors. If the input is less than -1 (radian), -PI/2 is returned. If the input is greater than 1 (radian), +PI/2 is returned.

Parameters:

arg - The angle in radians

Returns:

The arc sine, limited to the range -Pi/2 0 to Pi/2.

setIdentityMatrix

public static void setIdentityMatrix(double[] matrix)

Initializes a matrix to base (identity) values. The matrix is set as follows: [1][0][0] [0][1][0] [0][0][1]

Parameters:

matrix - The matrix to initialize

rotateVector

public static void rotateVector(double[] v,
                                double angle,
                                int axis)

Rotate a vector along the specified axis.

Parameters:

v - The vector to rotate

angle - The angle to use

axis - The axis along which to rotate

polarToCartesian

public static void polarToCartesian(double[] vect,
                                    double lon,
                                    double lat,
                                    double radius)

Convert polar coordinates with radius to Cartesian coordinates added by w. Strickling

Parameters:

vect - Vector to hold the Cartesian coordinates

lon - Polar longitude

lat - Polar latitude

polarToCartesian

public static void polarToCartesian(double[] vectC,
                                    double[] vectP)

Convert polar coordinates with radius to Cartesian coordinates added by w. Strickling

Parameters:

vectC - Vector to hold the Cartesian coordinates

vectP - Vector to hold the Polar coordinates

cartesianToPolar

public static void cartesianToPolar(double[] cartVect,
                                    double[] polarCoord)